package cn.stylefeng.guns.core.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtils {

    public static String dateStringConversion(String dateStr, String format, String formatNew) throws ParseException {
        Date format1 = new SimpleDateFormat(format).parse(dateStr);
        return new SimpleDateFormat(formatNew).format(format1);
    }
    public static Date dateStringByDate(String dateStr) throws ParseException {
        SimpleDateFormat ft = new SimpleDateFormat("yyyy-MM");
        return ft.parse(dateStr);
    }

    /**
     * date2比date1多的天数
     * @param date1
     * @param date2
     * @return
     */
    public static int differentDays(Date date1,Date date2)
    {
        Calendar cal1 = Calendar.getInstance();
        cal1.setTime(date1);

        Calendar cal2 = Calendar.getInstance();
        cal2.setTime(date2);
        int day1= cal1.get(Calendar.DAY_OF_YEAR);
        int day2 = cal2.get(Calendar.DAY_OF_YEAR);

        int year1 = cal1.get(Calendar.YEAR);
        int year2 = cal2.get(Calendar.YEAR);
        if(year1 != year2)   //同一年
        {
            int timeDistance = 0 ;
            for(int i = year1 ; i < year2 ; i ++)
            {
                if(i%4==0 && i%100!=0 || i%400==0)    //闰年
                {
                    timeDistance += 366;
                }
                else    //不是闰年
                {
                    timeDistance += 365;
                }
            }
            return timeDistance + (day2-day1) ;
        }
        else    //不同年
        {
            System.out.println("判断day2 - day1 : " + (day2-day1));
            return day2-day1;
        }
    }
    /**
     * 获取现在时间
     * @return返回字符串格式 yyyyMMddHHmmssSSS
     */
    public static String getStringAllDate() {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmssSSS");
        return formatter.format(new Date());
    }

    /**
     * 获取现在时间
     * @return返回字符串格式 yyyyMMddHHmmss
     */
    public static String getStringDate() {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");
        return formatter.format(new Date());
    }
    /**
     * 获取现在日期
     * @return返回字符串格式 yyMMdd
     */
    public static String getStringyyMMddDate() {
        SimpleDateFormat formatter = new SimpleDateFormat("yyMMdd");
        return formatter.format(new Date());
    }
    /**
     * 获取现在时间
     * @return返回字符串格式 yyyy-MM-dd
     */
    public static String getStringYmdDate() {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
        return formatter.format(new Date());
    }

}
